This is not a Hoster software problem, I assure you!
What's the operating temperature? This sounds like a "warming up" related problem.
If it gets too hot, the TV may be shutting down. Also, your video card and/or computer may be overheating. Make sure all air intake and outlet vents are clear and air is flowing. Is the air hot coming from your computer?
Give us as much facts and we'll all try to help you diagnose what is wrong with your setup.